clog up vs obstruct

clog up and obstruct both are verbs.

Word	Noun	Adjective	Verb	Adverb
clog up	No	No	Yes	No
obstruct	No	No	Yes	No

As verbs, obstruct is a hypernym of clog up; that is, obstruct is a word with a broader meaning than clog up:

Other hypernyms of clog up include block, close up, impede, jam, obturate, occlude.

clog up (verb)	obstruct (verb)
become or cause to become obstructed	block passage through
	shut out from view or get in the way so as to hide from sight
	hinder or prevent the progress or accomplishment of